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When to Plant Trailing Portulaca in Spearfish, SD

The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The USDA zone info for Spearfish should be reviewed to figure out when it's the best time to plant trailing portulaca.


Planting Calendar for Trailing Portulaca

Frost tolerance for trailing portulaca: Not tolerant of frost.
When to plant: After the last frost has passed.

Trailing Portulaca are not cold tolerant which tells us that you really should wait until it warms up after the last frost when the weather gets warmer before you can plant them.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant trailing portulaca
Possibly ok, but a risky time to plant trailing portulaca
Probably not a good time to plant trailing portulaca

The earliest that you can plant trailing portulaca in Spearfish is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant trailing portulaca and expect a good harvest is probably August. Any later than that and your trailing portulaca may not have a chance to really do well. If you are starting your trailing portulaca indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

The average date of last frost is April 15 in Spearfish. In the coldest months of winter you can expect an average low temperature of -20°F.

Keep in mind that the actual date of last frost is not always accurate because it is based on the USDA zone info for Spearfish and it can change quite a bit from year to year. Since half of the time in Spearfish you get surprised by a frost after April 15 be ready to protect your trailing portulaca in the event of a late frost.

USDA Zone Info for Spearfish

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)April 15
Average Date of First Frost (fall)October 15
Lowest Expected Low-20°F
Highest Expected Low-15°F

This means that on a really cold year, the coldest it will get is -20°F. On most years you should be prepared to experience lows near -15°F.

Plants to Grow in Spearfish

You may be interested in your other planting guides for Spearfish.